Device for flame treating surface

ABSTRACT

This invention relates to a device for flame treating surfaces wherein there is arranged at one end of an arm which can be displaced across the surface to be worked two or more nozzle tubes with associated nozzle heads inclined downwardly. At least one of the nozzle tubes can be swivelled about an axis parallel with and spaced from the axis of the nozzle tubes.

O United States Patent 1 [111 3,724,761 Stadler [451 Apr. 3, 1973 54| DEVICE FOR FLAME TREATING 2,125,179 7/1938 Doyle ..266/23 H X SURFACE 2,857,201 10/1958 Palmer ..239/587 X [76] Inventor: Siegfried Stadler, Vercinsstr. 14, P i r Examin -M, Henson Wood, Jr.

' 565 Solingen, Germany Assistant Examiner-John J. Love [22] Filed: June 10, 1971 Att0rney-Holman & Stern [21] App1.No.: 151,710 [57] ABSTRACT This invention relates to a device for flame treating 30] Foreign Application p i m surfaces wherein there is arranged at one end of an arm which can be displaced across the surface to be June 10, 1970 Germany ..P 20 28 516.9 worked two or more nozzle tubes h associated v zle heads inclined downwardly. At least one of the [52] US. Cl ..239/286, 239/588 nozzle tubes can be swivelled about an axis parallel [51] Int. Cl. ..B05b 15/08 with and spaced from the axis of the nozzle tubes. [58] Field 01 Search ..239/176, 175, 187,186,184, 239/286, 287,536, 587, 588; 266/23 H, 23 T [56] v References Cited 7 Claims, 4 Drawing Figures UNITED STATES PATENTS 3,016,201 1/1962 Brogden ..239/l76 X mmmms I975 3,724.761 sum 1 0F 2' FIG. I

INVENTOR syw PATENTEDAPRB 1975 3,724,761 sum 2 OF 2 I4 22 24 I6 25 23 I5 INVENTOR DEVICE FOR FLAME TREATING SURFACE This invention relates to a device for flame treating surfaces and especially for treating curved or partially curved surfaces of iron products. More particularly but not exclusively said device may be used for the working of the inner surface of iron moulds used in steel works.

Said treatment is required, if the surface or the edge region of the product to be worked is no longer suitable for further use. This is very frequently the case with iron moulds for steel works, where localized damage of varying degree, e.g. erosion or heat cracks can be produced during the casting of steel blocks, and where in addition the tolerances may change over larger surface areas. The steel blocks can then no longer be stripped and the iron mould concerned, unless subjected to a surface treatment of the above mentioned type, must be scrapped. In order to create an interal wall which makes further use possible, the flaming device requires very precise guiding. Above all, such a guiding system must take account of the fact that surfaces of the above mentioned type may possess a slight curvature which must be maintained.

The problem to be solved by the invention is the creation of a flaming device which enables a high outputto' be reached and also ensures that the flaming process leads to a new surface, the curvature if any of which corresponds to that of the original surface.

In accordance with the present invention there is provided a device for flame treating surfaces characterized in that at one end of an arm which can be displaced across the surface to be worked two or more downwardly are arranged, wherein at least one of said nozzle tubes can be swivelled about an axis parallel nozzle tubes with associated nozzle heads inclined one end of the surface to the other one. The slanting of I the nozzles makes it possible to work mainly horizontal surfaces. Because of the possibility of swivelling the nozzles, account can be taken of the appropriate inclination of a curved surface. In particular it is thus possible to adapt the system to the change in surface curvature in one co-ordinate direction by changing the inclination of the nozzles.

One advantageous design of the invention uses an'arrangernent where at least one central, fixed nozzle is arranged between two nozzles which can be swivelled outwards. In this way one obtains a relatively broad working surface which permits a very high output. It is desirable here to arrange the axis of swivel at a level between the lower edges of the nozzles and the axis of the central nozzle tube, and laterally, between the cen tral and appropriate outer nozzle tubes. With this type of arrangement one or both outer nozzles may be inclined in such a way that the ,whole width to be worked has the desired curvature.

For the adjustment of the curvature setting of the nozzles, the outer nozzles are conveniently designed in such a waythat they can be swivelled from the opposite end of the arm which supports them. It is also possible to connect guide wires at the outer nozzles, close to their respective tubes, which are diverted near the central nozzle tube to coincide with the longitudinal direction of the arm and which can be adjusted from the opposite arm end. The guide wires are continuously under stress here, because they are stressed by the force exerted by the outer nozzles. The nozzle tubes of the outer nozzles, during inclination of their appropriate nozzles, become inclined towards the central nozzle tube. The swivel axis lies between the nozzle tubes in such a way that no force acting in the opposite direction can be exerted.

With the new device, the arms are moved longitu-' dinally and laterally by means of a carriage of known design. Such a carriage requires a drive unit and also control units for the services of the nozzles, i.e. gas, oxygen and, where appropriate, iron powder, and lastly, control units for swivelling the nozzles. It is particularly advantageous to design the carriage in such a way that even with different levels the nozzles, which can already be adjusted along the surface co-ordinates, can be chosen accordingly. For this purpose the arm carrying the nozzles may be equipped at its end opposite to the nozzles with a bearing facilitating swivelling about a horizontal axis. Hence the nozzles can be adjusted not only for curvatures running laterally, but also for curvatures running longitudinally. In view of the restricted space on the carriage, the swivel facility is achieved conveniently by extending the arm beyond its swivel bearing, with a lever arm cranked upwards, at the end of which a wedge engages, which wedge is adjustable in a vertical direction and which is supportedThe wedge acts on the cranked lever at a trunnion disposed at the lever end. The vertical adjustment of the wedge takes place by means of a motor-driven spindle.

The invention will now be more particularly described with reference to the accompany drawings wherein:

FIG. 1 is a schematic diagram of one embodiment of a device in accordance with the invention.

FIG. 2 shows an end view of the nozzles which form part of the device shown in FIG. 1

FIG. 3 a plan view of the nozzles shown in FIG. 2 and FIG. 4 is an end view of the device with the nozzle heads removed for reasons of clarity.

Referring to FIG. 1 there is shown a movable carriage having wheels 1 and a base plate 2 which carries a drive unit (not illustrated in the drawing). At the front end of the base plate 2 there is provided a pillow block 3 for a swivel bearing 4 ofan arm 5. The arm 5 is provided with a lever end 6 cranked upwards, at the end of which a trunnion 7 isdisposed. The latter is in contact with a wedge 8, into which a spindle 9 engages. The wedge 8 is provided with a vertical guide system 10, which supports it, and which is also linked with the base plate 2. The spindle 9 is driven by a motor 11, and hence the wedge 8 also, so that its vertical displacement leads to a swivel motion of the arm 5.

At the front end of arm 5, there are nozzles, each consisting of a nozzle tube 12 and a downwardly inclined nozzle head 13 which can be charged with gas, oxygen and, where appropriate, iron powder, in a manner not illustrated in the drawing. Provision of the nozzle heads 13 serves to direct the flames at the surface to be treated.

FIG. 2 illustrates an arrangement with three nozzles, of which the two outer ones 14 and 15 can be swivelled laterally, whilst the central nozzle 16 cannot be swivelled laterally. The nozzles 14 and 15 swivel about axes 18 and 19 respectively. For the sake of clarity, the right hand nozzle 15 is illustrated with a considerable slant, where the working surface 15 of its nozzle head forms a considerable angle with the working surface 16' of the central nozzle. Usually an amount of swivel, at which the working surfaces mentioned are at a lesser angle to each other, suffices, because the curved sur faces are as a rule several times larger than the total nozzle area. In order to illustrate this, a curved surface 20 is illustrated beneath the heads of the nozzles mentioned.

FIG. 3 illustrates the front end of the aforesaid arm 5, which carries the nozzle 16, rigidly connected thereto. Here the nozzle 16 is held in place with its nozzle tube 12. On the right and left hand sides of the central nozzle 16 the laterally swivelling, outer nozzles 14 and 15 are provided. There corresponding nozzle tubes are conveniently inserted into rings 21, to which supporting arms 26 are connected, which can be swivelled relative to arm 5, about the axes 18 or 19. For the adjustment of the degree of swivel of the outer nozzles 14 and 15 control wires 22 and 23 respectively are used, which wires are secured at their one end to rings 21 and which are guided round guide rollers 24, 25 and fed in the direction parallel to the longitudinal axis of the arm through a through-bore 22 formed in the lever end 6 of the arm 5 from that side of which remote from the guide rollers 24, 25 the control wires 22 and 23 can be moved to adjust the position of the outer nozzle tubes 14 and 15. The swivelling of the outer nozzles about the axes l8 and 19 is done by adjustment of the control wires 22 or 23, from the carriage. The swivel axes 18 and 19 are disposed so close to their corresponding nozzles 14 and 15 that the latter still exert a force in their deflected position, owing to their weight and this force attempts to turn the working surfaces of the nozzle heads back into their normal position. In this limiting position the working surfaces of the nozzle heads hence have a common plane, as is required, for example, for the finishing of uncurved surfaces or uncurved surface sections. By means of stops which are not illustrated in the drawing, the outer nozzles 14 and 15 may be retained in this limiting position, so that their appropriate control wires 22 or 23 are free from stress.

I claim:

1. A device for flame treating surfaces comprising an arm, means mounting said arm for movement over the surface to be treated, a plurality of nozzle tubes each having an associated downwardly inclined nozzle head connected thereto, means fixedly mounting at least one central nozzle tube to said arm at a position between a pair of outer nozzle tubes, and means pivotally mounting said pair of outer nozzle tubes to said arm so that the pair of outer nozzle tubes can swivel outwards wherein the pivotal axes of the pair of outer nozzle tubes are disposed in a vertical direction between the lower edges of the nozzle heads and the axis of the central nozzle tube and disposed in a lateral direction between the central nozzle tube and the associated outer nozzle tube. I

2. A device as claimed in claim 1 wherein means are provided to effect pivotal movement of the outer no7. zle tubes from a position adjacent the other end of said arm.

3. A device as claimed in claim 2 wherein said means for effecting pivotal movement of said pair of nozzle tubes comprises a control wire linked to each of said pair of nozzle tubes which wires are diverted close to the central nozzle tube in the longitudinal direction of said arm, and which can be adjusted from the other end of said arm in a direction parallel to the longitudinal axis of said arm.

4. A device as claimed in claim 1 wherein said arm is movable by mounting it on a longitudinally and laterally movable carriage.

5. A device as claimed in claim 1 wherein said arm is pivotable about a horizontal axis.

6. A device as claimed in claim 5 wherein said arm is provided at said other end with an upwardly cranked extension where an adjustable, guided and supported wedge is in contact with the free end of said extension.

7. A device as claimed in claim 6 wherein a trunnion is mounted at said free end of the extension in contact with the wedge surface, whilst the wedge is vertically adjustable by means of a motor driven spindle. 

1. A device for flame treating surfaces comprising an arm, means mounting said arm for movement over the surface to be treated, a plurality of nozzle tubes each having an associated downwardly inclined nozzle head connected thereto, means fixedly mounting at least one central nozzle tube to said arm at a position between a pair of outer nozzle tubes, and means pivotally mounting said pair of outer nozzle tubes to said arm so that the pair of outer nozzle tubes can swivel outwards wherein the pivotal axes of the pair of outer nozzle tubes are disposed in a vertical direction between the lower edges of the nozzle heads and the axis of the central nozzle tube and disposed in a lateral direction between the central nozzle tube and the associated outer nozzle tube.
 2. A device as claimed in claim 1 wherein means are provided to effect pivotal movement of the outer nozzle tubes from a position adjacent the other end of said arm.
 3. A device as claimed in claim 2 wherein said means for effecting pivotal movement of said pair of nozzle tubes comprises a control wire linked to each of said pair of nozzle tubes which wires are diverted close to the central nozzle tube in the longitudinal direction of said arm, and which can be adjusted from the other end of said arm in a direction parallel to the longitudinal axis of said arm.
 4. A device as claimed in claim 1 wherein said arm is movable by mounting it on a longitudinally and laterally movable carriage.
 5. A device as claimed in claim 1 wherein said arm is pivotable about a horizontal axis.
 6. A device as claimed in claim 5 wherein said arm is provided at said other end with an upwardly cranked extension where an adjustable, guided and supported wedge is in contact with the free end of said extension.
 7. A device as claimed In claim 6 wherein a trunnion is mounted at said free end of the extension in contact with the wedge surface, whilst the wedge is vertically adjustable by means of a motor driven spindle. 